Charge-Density-Wave Formation in the Doped Two-Leg Extended Hubbard Ladder (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We investigate the electronic properties of a doped two-leg Hubbard ladder with both the onsite and nearest-neighbor Coulomb repulsions by using the weak-coupling renormalization-group method. It is shown that, for strong nearest-neighbor repulsions, the charge-density-wave state coexisting with the p-density-wave state becomes a dominant fluctuation where spins form intrachain singlets. By increasing doping rate, we have also shown that the effects of the nearest-neighbor repulsions are reduced and the system exhibits a quantum phase transition into the d-wave-like (or rung-singlet) superconducting state. We derive the effective fermion theory which describes the critical properties of the transition point with the gapless excitation of magnon. The phase diagram of the two-leg ladder compound, Sr_<14-x>Ca_x-Cu_<24>O_<41>, is discussed.
- 社団法人日本物理学会の論文
- 2004-04-15
著者
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Tsuchiizu Masahisa
Department Of Physics Nagoya University:(present) Yukawa Institute For Theoretical Physics Kyoto Uni
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Tsuchiizu Masahisa
Department Of Physics Nagoya University
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Suzumura Y
名古屋大 大学院理学研究科
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SUZUMURA Yoshikazu
Department of Physics, Nagoya University
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Suzumura Yoshikazu
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Suzumura Yoshikatsu
Department Of Physics Nagoya University:crest Japan Science And Technology Corporation (jst)
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SUZUMURA Yoshikazu
Department of Physics, Faculty of Science Tohoku University
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